there is no difficulty ___ can't be overcome in the world

问题描述:

there is no difficulty ___ can't be overcome in the world
a.which b.that c.what
为什么选B?怎么分析

首先___ can't be overcome in the world是定语从句,difficulty 是先行词,而且被 no修饰只能用that,that 是关系代词在定语从句中作主语.整句话的意思是世上没有克服不了的困难